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How to calculate space savings in a PS file

 
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vak255
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Joined: 10 Sep 2004
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PostPosted: Tue May 20, 2014 11:52 am    Post subject: How to calculate space savings in a PS file Reply with quote

I have a PS file from which we are removing the invalid records.

This GDG has total of 4814326 records out of which 145965 records were invalid. Removing them will result in space saving of 3.03% .

Please find below the details.

Code:
Organization  . . . : PS     
Record format . . . : FB     
Record length . . . : 128   
Block size  . . . . : 27904 
1st extent cylinders: 199   
Secondary cylinders : 16     

Current Allocation             
 Allocated cylinders : 737     
 Allocated extents . : 5       
                               
                               
                               
Current Utilization             
 Used cylinders  . . : 737     
 Used extents  . . . : 5       


I like to know how should I convert this 3.03% to bytes. I know its not much but there are like 1000 files. so this will add up and my shop want me to list in bytes\tracks. Thanks for your valuable time.
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kolusu
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PostPosted: Tue May 20, 2014 11:59 am    Post subject: Reply with quote

vak255,

You can use ISMF to generate reports for space usage before and after removing the invalid records.

Kolusu
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vak255
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Joined: 10 Sep 2004
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PostPosted: Tue May 20, 2014 12:35 pm    Post subject: Reply with quote

Thanks Kolusu.
There are 1000s of files, I am trying to calculate it prior to removing the records.

So from the above sample, if I remove 145965 records from the file. Each record extends to 128.

so total space reduced is 145965 * 128 = 18683520 bytes ?
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kolusu
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PostPosted: Tue May 20, 2014 1:06 pm    Post subject: Reply with quote

vak255,

If the space is NOT released(RLSE parm in JCL) after the step completion then you won't see the free space even though you deleted the records. So make sure every step has RLSE coded.

ISMF gives you a lot of options to generate a report based on VOLUME and Dataset name filter.

Kolusu
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vak255
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PostPosted: Tue May 20, 2014 1:38 pm    Post subject: Reply with quote

Thanks for all the details.
The steps already has the RLSE coded.

How should I generate ISMF report?
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kolusu
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PostPosted: Tue May 20, 2014 3:59 pm    Post subject: Reply with quote

vak255 wrote:
How should I generate ISMF report?


Using the sample JCL for batch in the SYS1.SACBCNTL library
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vak255
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PostPosted: Tue May 20, 2014 10:11 pm    Post subject: Reply with quote

Thanks so much, Kolusu.
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